import tkinter as tk

window = tk.Tk()
window.title("小A君")
window.geometry("200x200")

var1 = tk.StringVar()
l = tk.Label(window,bg = "yellow",width = 4,textvariable = var1)
l.pack()

def print_selection():
    value = lb.get(lb.curselection())
    var1.set(value)
    
b1=tk.Button(window,text = "print selection",width = 15,height = 2,
             command = print_selection)
b1.pack()

var2 = tk.StringVar()
var2.set((11,22,33,44))
lb = tk.Listbox(window,listvariable = var2)
list_items = [1,2,3,4]
for item in list_items:
    lb.insert("end",item)
lb.insert(1,"first")
lb.insert(3,"third")
lb.delete(2)
lb.pack()

window.mainloop()
'''不断循环刷新'''

